- Joined: December 2006
- Location: Spring, TX
- Post Count: 86
Re: Onkyo 705: Trying to prevent potential hum.
The hum there is often referred to is a "60Hz ground loop" and is not related to other items that share the AC circuit. Ground loops are caused by your HT compounds not having a common ground, and then having current flowing between them. Ground loops are not all that common, however they can be a pain to fix if you happen to have one.
To reduce the likely hood of having ground loops make sure that your equipment is connected to a common AC point that is properly grounded. Also, it sometimes helps to have each component tied to a good ground.
As I said, ground loops are not common so don't spend a lot of time fixing a problem before you know it exists. Just follow good installation practices and you should be fine.
Samsung HL-S6188 TV
Onkyo 805 AVR
Samsung P1400 Blu-ray & Oppo 971 DVD Players
DTV HR22 DVR
Infinity Beta 50's Front Speakers, C360 Center Speaker, and Beta 20's Surrounds, Hsu VTF MK 2 Subwoofer w/Turbo, & APC J15 UPS & Power Conditioner
- Joined: August 1999
- Location: Katy, TX
- Post Count: 5,823
Re: Onkyo 705: Trying to prevent potential hum.
Quote:
| As I finish the electric on my HT: If I put my lights on one circuit and and components on another, will this prevent the possibility of the infamous humm that I read about? |
It's never a bad idea to put the HT gear on a dedicated circuit, but that's not necessarily a guarantee that you won't get any noise from ground loops. The most common cause is not lights, but cable TV or satellite feeds that are not properly grounded. Lighting dimmers can also cause noise, all the more reason to keep lights on a separate circuit, especially if you're going to use dimmers.
Regards,
Wayne A. Pflughaupt
My Equipment List“A nice mid-fi system,” according to an audiophile acquaintance.
My Tech / DIY Articles and Reviews
